CARRS Surveillance study: design and methods to assess burdens from multiple perspectives by Nair, M, Ali, M, Ajay, V, Shivashankar, R, Mohan, V, Pradeepa, R, Deepa, M, Khan, H, Kadir, M, Fatmi, Z, Reddy, K, Tandon, N, Narayan, K, Prabhakaran, D